Objenesis before 3.6 contains a type confusion vulnerability that allows code in one class loader to substitute objects into another by exploiting instantiator caching keyed on class name. When a shared ObjenesisStd instance caches instantiators by clazz.getName() in ObjenesisBase.getInstantiatorOf(), same-named classes collide, causing newInstance() to return wrong-class objects and ClassCastException failures.
Advisories

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Fixes

Solution

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Workaround

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History

Mon, 26 Oct 2026 19:15:00 +0000

Type Values Removed Values Added
First Time appeared Easymock
Easymock objenesis
Vendors & Products Easymock
Easymock objenesis

Mon, 26 Oct 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 26 Oct 2026 14:00:00 +0000

Type Values Removed Values Added
Description Objenesis before 3.6 contains a type confusion vulnerability that allows code in one class loader to substitute objects into another by exploiting instantiator caching keyed on class name. When a shared ObjenesisStd instance caches instantiators by clazz.getName() in ObjenesisBase.getInstantiatorOf(), same-named classes collide, causing newInstance() to return wrong-class objects and ClassCastException failures.
Title Objenesis before 3.6 Type Confusion via Class Name Instantiator Cache
Weaknesses CWE-386
References
Metrics cvssV3_1

{'score': 4.5, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L'}

cvssV4_0

{'score': 2, 'vector': 'CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-26T16:15:59.231Z

Reserved: 2026-10-26T11:37:37.948Z

Link: CVE-2026-116486

cve-icon Vulnrichment

Updated: 2026-10-26T15:38:11.478Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-26T14:16:37.200

Modified: 2026-10-26T18:39:42.503

Link: CVE-2026-116486

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-26T18:50:39Z

Weaknesses